Description: Exports the cram_to_bam function to support the
  sambamba package.
Author: Roel Janssen <roel@gnu.org>

--- a/cram/cram_decode.c
+++ b/cram/cram_decode.c
@@ -2999,8 +2999,8 @@ int cram_decode_slice_mt(cram_fd *fd, cr
  * Returns the used size of the bam record on success
  *         -1 on failure.
  */
-static int cram_to_bam(sam_hdr_t *sh, cram_fd *fd, cram_slice *s,
-                       cram_record *cr, int rec, bam_seq_t **bam) {
+int cram_to_bam(sam_hdr_t * const sh, const cram_fd * const fd, cram_slice * const s,
+                       cram_record * const cr, int rec, bam_seq_t ** const bam) {
     int ret, rg_len;
     char name_a[1024], *name;
     int name_len;
--- a/cram/cram_decode.h
+++ b/cram/cram_decode.h
@@ -106,6 +106,23 @@ int cram_decode_slice(cram_fd *fd, cram_
 
 
 /*
+ * Converts a cram in-memory record into a bam in-memory record. We
+ * pass a pointer to a bam_seq_t pointer along with the a pointer to
+ * the allocated size. These can initially be pointers to NULL and zero.
+ *
+ * This function will reallocate the bam buffer as required and update
+ * (*bam)->alloc accordingly, allowing it to be used within a loop
+ * efficiently without needing to allocate new bam objects over and
+ * over again.
+ *
+ * Returns the used size of the bam record on success
+ *         -1 on failure.
+ */
+int cram_to_bam(SAM_hdr * const bfd, const cram_fd * const fd, cram_slice * const s,
+                cram_record *const cr, int rec, bam_seq_t ** const bam);
+
+
+/*
  * Drains and frees the decode read-queue for a multi-threaded reader.
  */
 void cram_drain_rqueue(cram_fd *fd);